if what you're talking about is what i'm thinking of, which is the harness straps hooked up to the elastic bungees that slide down a wire from a higher point to a lower point, this contraption is not the same animal we're talking about.
the one at vance was a pulley on a cord about 8 feet off the ground. when i dangle my monkey arms my feet were probably a dizzying 6 inches off the ground. some pretty serious acceleration can happen from that height.
The harness straps device is the 34 foot tower. The lateral drift trainer is identical to the lateral drift apparatus from Benning. This article tells the story:http://www.vance.af.mil/news/story.asp?id=123072088.